pub fn try_combine_lo_hi_commitments(
comm_lo: &PedersenCommitment,
comm_hi: &PedersenCommitment,
bit_length: usize,
) -> Option<PedersenCommitment>
pub fn try_combine_lo_hi_commitments(
comm_lo: &PedersenCommitment,
comm_hi: &PedersenCommitment,
bit_length: usize,
) -> Option<PedersenCommitment>